It is reasonable that some molecular responses to aluminium toxicity and phosphate starvation stresses may be co-opted, as these stresses co-exist in the same environment and the most directly affected organ is the root in both cases .Some findings pointing to co-opted responses have already been reported, like the exudation of organic acids by root tips, that chelates Al3+ ions and at the same time increase phosphate availability, activation of the same transcriptional regulator triggered by both stresses and possibilities of hormone signalling crosstalk.There are already reports in the literature of applications of molecular knowledge about adaptation to acid soils in commercially relevant crops. Here we focus on studyng the broad transcriptomic response to aluminium and phosphate starvation stresses in Populus ssp. as a model plant for woody crops, due to its genetic, genomic and transcriptomic data availability.In view of the above, this work highlights the transcriptional responses to aluminum toxicity and phosphate starvation in Populusspp. by the use of public microarray data and points to connections between the responses to the two stresses through gene co-expression networks. This approach is justified by the importance of understanding the relationship between the responses of these two major coexisting stresses in acidic soils and the lack of studies that address this relationship, as well as the responses to each stress in a specific way, in broad transcriptomic data.